Wasn't sure on this kit after doing a bit of research with several others. Took a chance. For me I set aside 1 day taking a lot of time, being meticulous and test fitting everything several times before final install. I decided to place the HVAC controls on the upper level due to it being more important to learn and have easier access to the controls. I soldered and heat shrinked all of the wiring after all checks. The most difficult portion was placing all the wiring harness behind the panel/HU and installing the set-up into the dash. Everything works as it should and looks great in my car. Just take time and be detail oriented and it will all go together.